Optical imaging lens

ABSTRACT

An optical imaging lens may include a first, a second, a third and a fourth lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of the four lens elements, the optical imaging lens may provide improved imaging quality and optical characteristics, increased field of view and increased aperture while the optical imaging lens may satisfy (G34+T4)/AAG≤2.200 and V1+V2+V3+V4≥110.000, wherein an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, a thickness of the fourth lens element along the optical axis is represented by T4, a sum of the three air gaps from the first lens element to the fourth lens element along the optical axis is represented by AAG and Abbe numbers of the first to the fourth lens elements are represented by V1, V2, V3 and V4.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.201811623272.1 titled “Optical Imaging Lens,” filed on Dec. 28, 2018,with the State Intellectual Property Office of the People's Republic ofChina (SIPO).

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, andparticularly, to an optical imaging lens having four lens elements.

BACKGROUND

Technology improves every day, continuously expanding consumer demandfor increasingly compact electronic devices. As a result, key componentsof optical imaging lenses that are incorporated into consumer electronicproducts should keep pace with technological improvements in order tomeet the expectations of consumers. Some important characteristics of anoptical imaging lens include image quality and size. In response to theenvironment with insufficient light, there may also be demands for anincreased field of view and a large aperture. As image sensor technologyimproves, consumers' expectations related to image quality have alsorisen. Accordingly, in addition to reducing the size of the imaginglens, achieving good optical characteristics and performance should alsobe considered.

Decreasing the dimensions of an optical lens while maintaining goodoptical performance might not be achieved simply by scaling down thelens. Rather, these benefits may be realized by improving other aspectsof the design process, such as by varying the material used for the lensor adjusting the assembly yield.

In this manner, there is a continuing need for improving the designcharacteristics of optical lenses that have increasingly reduced thedimensions. Achieving these advancements may entail overcoming uniquechallenges, even when compared to design improvements for traditionaloptical lenses. However, refining aspects of the optical lensmanufacturing process that result in a lens that meets consumer demandsand provides upgrades to imaging quality continues to be a desirableobjective for industries, governments, and academia.

SUMMARY

In light of the abovementioned problems, the optical imaging lens havinggood imaging quality, a shortened length, increased field of view andincreased aperture is the point of improvement.

The present disclosure provides an optical imaging lens for capturingimages and videos such as the optical imaging lens of cell phones,cameras, tablets and personal digital assistants, and car lenses. Bycontrolling the convex or concave shape of the surfaces of four lenselements, the size of the optical imaging lens may be reduced and fieldof view of the optical imaging lens may be extended while maintaininggood optical characteristics.

In the specification, parameters used herein may include:

Parameter Definition T1 A thickness of the first lens element along theoptical axis G12 A distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, i.e., an air gap between the first lens element andthe second lens element along the optical axis T2 A thickness of thesecond lens element along the optical axis G23 A distance from theimage-side surface of the second lens element to the object- sidesurface of the third lens element along the optical axis, i.e., an airgap between the second lens element and the third lens element along theoptical axis T3 A thickness of the third lens element along the opticalaxis G34 A distance from the image-side surface of the third lenselement to the object-side surface of the fourth lens element along theoptical axis, i.e., an air gap between the third lens element and thefourth lens element along the optical axis T4 A thickness of the fourthlens element along the optical axis G4F A distance from the image-sidesurface of the fourth lens element to the object- side surface of thefiltering unit along the optical axis, i.e., an air gap between thefourth lens element and the filtering unit along the optical axis TTF Athickness of the filtering unit along the optical axis GFP A distancefrom the image-side surface of the filtering unit to the image planealong the optical axis, i.e., an air gap between the filtering unit andthe image plane along the optical axis f1 A focal length of the firstlens element f2 A focal length of the second lens element f3 A focallength of the third lens element f4 A focal length of the fourth lenselement n1 A refractive index of the first lens element n2 A refractiveindex of the second lens element n3 A refractive index of the third lenselement n4 A refractive index of die fourth lens element V1 An Abbenumber of the first lens element V2 An Abbe number of the second lenselement V3 An Abbe number of the third lens element V4 An Abbe number ofthe fourth lens element HFOV Half Field of View of the optical imaginglens Fno F-number of the optical imaging lens EFL An effective focallength of the optical imaging lens TTL A distance from the object-sidesurface of the first lens element to the image plane along the opticalaxis, i.e., the length of the optical imaging lens ALT A sum of thethicknesses of four lens elements from the first lens element to thefourth lens element along the optical axis, i.e., a sum of thethicknesses of the first lens element, the second lens element, thethird lens element and the fourth lens element along the optical axisAAG A sum of the three air gaps from the first lens element to thefourth lens element along the optical axis, i.e., a sum of the adistance from the image-side surface of the first lens element to theobject-side surface of the second lens element along the optical axis, adistance from the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis,and a distance from the image-side surface of the third lens element tothe object-side surface of the fourth lens element along the opticalaxis. BFL A back focal length of the optical imaging lens, i.e., adistance from the image- side surface of the fourth lens element to theimage plane along the optical axis TL A distance from the object-sidesurface of the first lens element to the image-side surface of thefourth lens element along the optical axis Tmin The minimum of the fourthicknesses from the first lens element to the fourth lens element alongthe optical axis Tmax The maximum of the four thicknesses from the firstlens element to the fourth lens elements along the optical axis Gmin Theminimum of the three air gaps from the first lens element to the fourthlens element along the optical axis Gmax The maximum of the three airgaps from the first lens element to the fourth lens element along theoptical axis ImgH An image height of the optical imaging lens

According to an embodiment of the optical imaging lens of the presentdisclosure, an optical imaging lens may comprise a first lens element, asecond lens element, a third lens element and a fourth lens elementsequentially from an object side to an image side along an optical axis.The first lens element to the fourth lens element may each comprise anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through. The first lenselement may have negative refracting power. The second lens element mayhave positive refracting power. A periphery region of the object-sidesurface of the second lens element may be concave. An optical axisregion of the image-side surface of the second lens element may beconcave. An optical axis region of the object-side surface of the thirdlens element may be concave. An optical axis region of the image-sidesurface of the fourth lens element may be concave. The optical imaginglens may comprise no other lenses having refracting power beyond thefour lens elements. The optical imaging lens may satisfy Inequalities:

(G34+T4)/AAG≤2.200   Inequality (1); and

V1+V2+V3+V4≥110.000   Inequality (2).

According to another embodiment of the optical imaging lens of thepresent disclosure, an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element and a fourth lenselement sequentially from an object side to an image side along anoptical axis. The first lens element to the fourth lens element may eachcomprise an object-side surface facing toward the object side andallowing imaging rays to pass through and an image-side surface facingtoward the image side and allowing the imaging rays to pass through. Thefirst lens element may have negative refracting power. A peripheryregion of the image-side surface of the first lens element may beconvex. The second lens element may have positive refracting power. Aperiphery region of the object-side surface of the second lens elementmay be concave. An optical axis region of the image-side surface of thesecond lens element may be concave. An optical axis region of theimage-side surface of the fourth lens element may be concave. Theoptical imaging lens may comprise no other lenses having refractingpower beyond the four lens elements. The optical imaging lens maysatisfy Inequalities:

(G34+T4)/AAG≤2.200   Inequality (1); and

V1+V2+V3+V4≥110.000 Inequality (2).

In abovementioned two exemplary embodiments, some Inequalities could beselectively taken into consideration as follows:

TTL/EFL≤2.500   Inequality (3);

TL/ImgH≤1.800   Inequality (4);

AAG/T1≤1.600   Inequality (5);

ALT/EFL≤1.300   Inequality (6);

TL/(G23+T3)≤2.400 Inequality (7);

(ALT+BFL)/ImgH≤2.100   Inequality (8);

(T3+G34+T4)/(T1+G12)≤2.800   Inequality (9);

TTL/(T1+G12+T2+G23+T3)≤2.000   Inequality (10);

EFL/BFL≤2.200   Inequality (11);

TL/EFL≤1.700   Inequality (12);

TTL/ImgH≤2.400   Inequality (13);

AAG/G23 <1.900   Inequality (14);

ALT/(T2+T3)≤1.800   Inequality (15);

TL/BFL≤2.600   Inequality (16);

BFL/T3≤1.800   Inequality (17);

(T2+G23+T3)/(T1+T4)≤2.600   Inequality (18);

(T1+T2)/T3≤1.200 Inequality (19); and

AAG/(T1+T2)≤1.000   Inequality (20).

In some example embodiments, more details about the convex or concavesurface structure, refracting power or chosen material etc. could beincorporated for one specific lens element or broadly for a plurality oflens elements to improve the control for the system performance and/orresolution. It is noted that the details listed herein could beincorporated into the example embodiments if no inconsistency occurs.

Through controlling the convex or concave shape of the surfaces and atleast one inequality, the optical imaging lens in the exampleembodiments may achieve good imaging quality, the length of the opticalimaging lens may be effectively shortened, and field of view andaperture of the optical imaging lens may be extended.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appendeddrawings, in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to one embodiment of the present disclosure;

FIG. 2 depicts a schematic view of a relation between a surface shapeand an optical focus of a lens element;

FIG. 3 depicts a schematic view of a first example of a surface shapeand an effective radius of a lens element;

FIG. 4 depicts a schematic view of a second example of a surface shapeand an effective radius of a lens element;

FIG. 5 depicts a schematic view of a third example of a surface shapeand an effective radius of a lens element;

FIG. 6 depicts a cross-sectional view of the optical imaging lensaccording to the first embodiment of the present disclosure;

FIG. 7 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe first embodiment of the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of anoptical imaging lens according to the first embodiment of the presentdisclosure;

FIG. 9 depicts a table of aspherical data of the optical imaging lensaccording to the first embodiment of the present disclosure;

FIG. 10 depicts a cross-sectional view of the optical imaging lensaccording to the second embodiment of the present disclosure;

FIG. 11 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe second embodiment of the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens according to the second embodiment of the presentdisclosure;

FIG. 13 depicts a table of aspherical data of the optical imaging lensaccording to the second embodiment of the present disclosure;

FIG. 14 depicts a cross-sectional view of the optical imaging lensaccording to the third embodiment of the present disclosure;

FIG. 15 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations the optical imaging lens according to thethird embodiment of the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens according to the third embodiment of the presentdisclosure;

FIG. 17 depicts a table of aspherical data of the optical imaging lensaccording to the third embodiment of the present disclosure;

FIG. 18 depicts a cross-sectional view of the optical imaging lensaccording to the fourth embodiment of the present disclosure;

FIG. 19 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe fourth embodiment of the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens according to the fourth embodiment of the presentdisclosure;

FIG. 21 depicts a table of aspherical data of the optical imaging lensaccording to the fourth embodiment of the present disclosure;

FIG. 22 depicts a cross-sectional view of the optical imaging lensaccording to the fifth embodiment of the present disclosure;

FIG. 23 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe fifth embodiment of the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens according to the fifth embodiment of the presentdisclosure;

FIG. 25 depicts a table of aspherical data of the optical imaging lensaccording to the fifth embodiment of the present disclosure;

FIG. 26 depicts a cross-sectional view of the optical imaging lensaccording to the sixth embodiment of the present disclosure;

FIG. 27 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe sixth embodiment of the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of theoptical imaging lens according to the sixth embodiment of the presentdisclosure;

FIG. 29 depicts a table of aspherical data of the optical imaging lensaccording to the sixth embodiment of the present disclosure;

FIG. 30 depicts a cross-sectional view of the optical imaging lensaccording to the seventh embodiment of the present disclosure;

FIG. 31 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe seventh embodiment of the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of theoptical imaging lens according to the seventh embodiment of the presentdisclosure;

FIG. 33 depicts a table of aspherical data of the optical imaging lensaccording to the seventh embodiment of the present disclosure;

FIG. 34 depicts a cross-sectional view of the optical imaging lensaccording to the eighth embodiment of the present disclosure;

FIG. 35 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe eighth embodiment of the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of theoptical imaging lens according to the eighth embodiment of the presentdisclosure;

FIG. 37 depicts a table of aspherical data of the optical imaging lensaccording to the eighth embodiment of the present disclosure;

FIG. 38 is a table for the values of T1, G12, T2, G23, T3, G34, T4, G4F,TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2) as determined in the first to eighth embodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentdisclosure. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the disclosure. In this respect, as used herein, theterm “in” may include “in” and “on”, and the terms “a”, “an” and “the”may include singular and plural references. Furthermore, as used herein,the term “by” may also mean “from”, depending on the context.Furthermore, as used herein, the term “if” may also mean “when” or“upon”, depending on the context. Furthermore, as used herein, the words“and/or” may refer to and encompass any and all possible combinations ofone or more of the associated listed items.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1, a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1, the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2, optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2. Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2. Accordingly, since theextension line EL of the ray intersects the optical axis I on the objectside A1 of the lens element 200, periphery region Z2 is concave. In thelens element 200 illustrated in FIG. 2, the first transition point TP1is the border of the optical axis region and the periphery region, i.e.,TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex- (concave-) region,” can be usedalternatively.

FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3, only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3, since the shape of the optical axis regionZ1 is concave, the shape of the periphery region Z2 will be convex asthe shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4, a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4, theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5, the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

According to an embodiment of the optical imaging lens of the presentdisclosure, an optical imaging lens may comprise a first lens element, asecond lens element, a third lens element and a fourth lens elementsequentially from an object side to an image side along an optical axis.The first lens element to the fourth lens element may each comprise anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through. By designing thefollowing detail features of four lens elements incorporated oneanother, the length of the optical imaging lens may be effectivelyshortened, and field of view and aperture of the optical imaging lensmay be effectively extended while maintaining good opticalcharacteristics.

In some embodiments of the optical imaging lens of the presentdisclosure, the first lens element having negative refracting power maybe beneficial for extending the field of view of the optical imaginglens. The second lens element having positive refracting power and aperiphery region of the object-side surface of the second element beingconcave may be beneficial for gather large-angle light. An optical axisregion of the image-side surface of the second lens element beingconcave may be beneficial for correcting aberration generated from thefirst lens element. An optical axis region of the image-side surface ofthe fourth lens element being concave may be beneficial for correctinglocal aberration.

Moreover, the optical imaging lens satisfying an Inequality (1),(G34+T4)/AAG≤2.200, may be beneficial for reducing the length of theoptical imaging lens and extending the field of view of the opticalimaging lens. The further restrictions for Inequality (1) that mayconstitute better configuration are as follows:0.200≤(G34+T4)/AAG≤2.200. Further, the optical imaging lens satisfyingan Inequality (2), V1+V2+V3+V4≥110.000, may be beneficial for correctingchromatic aberration of the optical system and reducing the length ofthe optical imaging lens, and the further restrictions for Inequality(2) that may constitute better configuration are as follows:110.000≤V1+V2+V3+V4 194.000.

Optionally, an optical axis region of the object-side surface of thethird lens element being concave may be beneficial for correctingaberration generated from the first lens element and the second lenselement. Optionally, a periphery region of the image-side surface of thefirst lens element being convex may be beneficial for achieving betteroptical performance.

According to some embodiments of the optical imaging lens the presentdisclosure, selectively designing the optical imaging lens in accordancewith the following Inequalities may assist the designer in designing anoptical imaging lens that has good optical performance, is effectivelyshortened in overall length, and is technically feasible.

In some embodiments of the optical imaging lens of the presentdisclosure, in addition to Inequalities (1) and (2), the optical imaginglens may satisfy at least one of Inequalities (5), (6), (9), (14), (15),(17)-(20) for decreasing the length of the optical imaging lens andimproving the imaging quality thereof by adjusting air gaps between thelens elements or thicknesses of the lens elements along the opticalaxis. Since the difficulty of manufacture and the optical performancemay also be considered, the air gaps between the lens elements orthicknesses of the lens elements along the optical axis need to bemutually allocated, or the ratio of value combination for specificoptical parameters in the specific lens group. The further restrictionsfor Inequalities (5), (6), (14), (15), (17)-(20) defined below mayconstitute better configuration:

0.400≤AAG/T1≤1.600;

0.200≤ALT/EFL≤1.300;

0.200AAG/(T1+T2)≤1.000;

0.800≤BFL/T3≤1.800;

1.100≤(T3+G34+T4)/(T1+G12)≤2.800;

1.200≤ALT/(T2+T3)≤1.800;

1.000≤AAG/G23 1.900;

1.000≤(T2+G23+T3)/(T1+T4)≤2.600; and

0.400≤(T1+T2)/T3≤1.200.

In some embodiments of the optical imaging lens of the presentdisclosure, the optical imaging lens may satisfy at least one ofInequalities (3), (4), (7), (10), (12), (13) and (16), such that theratio between optical imaging lens parameters of the optical element andthe length of the optical imaging lens (TTL) may have appropriatevalues. The further restrictions for Inequalities (3), (4), (7), (10),(12), (13) and (16) defined below may prevent optical imaging lensparameters that are too large to allow the length of the optical imaginglens to be sufficiently shortened, and prevent optical imaging lensparameters that are too small to interfere with assembly of the opticalimaging lens:

0.900≤TTL/EFL≤2.500;

1.300≤TL/BFL≤2.600;

1.300≤TL/(G23+T3)≤2.400;

1.200≤TTL/(T1+G12+T2+G23+T3)≤2.000;

0.600≤TL/EFL≤1.700;

1.200≤TTL/ImgH≤2.400;

0.900≤TL/ImgH 1.800.

Since shortened EFL may be beneficial for extending the field of view ofthe optical imaging lens in some embodiments of the present disclosure,EFL should be shortened and the optical imaging lens may satisfyInequality (11) for extending the field of view of the optical imaginglens during slimming the optical system. Moreover, the furtherrestrictions for Inequality (11) defined below may constitute betterconfiguration: 1.100≤EFL/BFL≤2.200.

Since increased ImgH may be beneficial for improving optical performancein some embodiments of the present disclosure, ImgH should be increasedand the optical imaging lens may satisfy Inequalities (4), (8) and (13)for improving imaging sharpness during slimming the optical system.Moreover, the further restrictions for Inequality Inequalities (4), (8)and (13) defined below may constitute better configuration:

1.200≤TTL/ImgH≤2.400;

0.900≤TL/ImgH≤1.800; and

1.100≤(ALT+BFL)/ImgH≤2.100.

In addition, any combination of the parameters of the embodiment may beselected to increase the optical imaging lens limitation to facilitatethe optical imaging lens design of the same architecture of the presentinvention. In consideration of the non-predictability of design for theoptical system, while the optical imaging lens may satisfy any one ofinequalities described above, the optical imaging lens according to thedisclosure herein may achieve a shortened length and an extended fieldof view, provide an increased aperture, improve an imaging qualityand/or assembly yield, and/or effectively improve drawbacks of a typicaloptical imaging lens.

Several exemplary embodiments and associated optical data will now beprovided to illustrate non-limiting examples of optical imaging lenssystems having good optical characteristics, an increased aperture andan extended field of view. Reference is now made to FIGS. 6-9. FIG. 6illustrates an example cross-sectional view of an optical imaging lens 1having four lens elements according to a first example embodiment. FIG.7 shows example charts of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens 1 according tothe first example embodiment. FIG. 8 illustrates an example table ofoptical data of each lens element of the optical imaging lens 1according to the first example embodiment. FIG. 9 depicts an exampletable of aspherical data of the optical imaging lens 1 ccording to thefirst example embodiment.

As shown in FIG. 6, the optical imaging lens 1 of the presentembodiment, in an order from an object side A1 tan image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3 and a fourth lenselement L4. A filtering unit TF and an image plane IMA of an imagesensor (not shown) may be positioned at the image side A2 of the opticalimaging lens 1. Each of the first, second, third and fourth lenselements L1, L2, L3 and L4, and the filtering unit TF may comprise anobject-side surface L1A2/L2A1/L3A1/L4A1/TFA1 facing toward the objectside A1 and an image-side surface L1A2/L2A2/L3A2/L4A2/TFA2 facing towardthe image side A2. The example embodiment of the illustrated filteringunit TF may be positioned between the fourth lens element L4 and theimage plane IMA. The filtering unit TF may be a filter for preventingunwanted light from reaching the image plane IMA and affecting imagingquality.

Exemplary embodiments of each lens element of the optical imaging lens 1will now be described with reference to the drawings. The lens elementsL1, L2, L3 and L4 of the optical imaging lens 1 may be constructed usingplastic materials in this embodiment.

An example embodiment of the first lens element L1 may have negativerefracting power. The optical axis region L1A1C of the object-sidesurface L1A1 of the first lens element L1 may be convex. The peripheryregion L1A1P of the object-side surface L1A1 of the first lens elementL1 may be concave. The optical axis region L1A2C of the image-sidesurface L1A2 of the first lens element L1 may be concave. The peripheryregion L1A2P of the image-side surface L1A2 of the first lens element L1may be convex.

An example embodiment of the second lens element L2 may have positiverefracting power. The optical axis region L2A1C of the object-sidesurface L2A1 of the second lens element L2 may be convex. The peripheryregion L2A1P of the object-side surface L2A1 of the second lens elementL2 may be concave. The optical axis region L2A2C of the image-sidesurface L2A2 of the second lens element L2 may be concave. The peripheryregion L2A2P of the image-side surface L2A2 of the second lens elementL2 may be convex.

An example embodiment of the third lens element L3 may have positiverefracting power. The optical axis region L3A1C of the object-sidesurface L3A1 of the third lens element L3 may be concave. The peripheryregion L3A1P of the object-side surface L3A1 of the third lens elementL3 may be convex. Both of the optical axis region L3A2C and theperiphery region L3A2P of the image-side surface L3A2 of the third lenselement L3 may be convex.

An example embodiment of the fourth lens element L4 may have negativerefracting power. The optical axis region L4A1C of the object-sidesurface L4A1 of the fourth lens element L4 may be convex. The peripheryregion L4A1P of the object-side surface L4A1 of the fourth lens elementL4 may be concave. The optical axis region L4A2C of the image-sidesurface L4A2 of the fourth lens element L4 may be concave. The peripheryregion L4A2P of the image-side surface L4A2 of the fourth lens elementL4 may be convex.

The aspherical surfaces including the object-side surface L1A1 and theimage-side surface L1A2 of the first lens element L1, the object-sidesurface L2A1 and the image-side surface L2A2 of the second lens elementL2, the object-side surface L3A1 and the image-side surface L3A2 of thethird lens element L3, the object-side surface L4A1 and the image-sidesurface L4A2 of the fourth lens element L4 may all be defined by thefollowing aspherical formula (1):

$\begin{matrix}{{Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}} & {{formula}\mspace{20mu} (1)}\end{matrix}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant; and

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 9.

FIG. 7(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (920 nm, 940 nm and 960 nm), wherein thevertical axis of FIG. 7(a) defines the field of view. FIG. 7(b) showsthe field curvature aberration in the sagittal direction for threerepresentative wavelengths (920 nm, 940 nm and 960 nm), wherein thevertical axis of FIG. 7(b) defines the image height. FIG. 7(c) shows thefield curvature aberration in the tangential direction for threerepresentative wavelengths (920 nm, 940 nm and 960 nm), wherein thevertical axis of FIG. 7(c) defines the image height. FIG. 7(d) shows avariation of the distortion aberration, wherein the vertical axis ofFIG. 7(d) defines the image height. The three curves with differentwavelengths (920 nm, 940 nm and 960 nm) may represent that off-axislight with respect to these wavelengths may be focused around an imagepoint. From the vertical deviation of each curve shown in FIG. 7(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.02 mm Therefore, the first embodiment may improve thelongitudinal spherical aberration with respect to different wavelengths.Referring to FIG. 7(b), the focus variation with respect to the threedifferent wavelengths (920 nm, 940 nm and 960 nm) in the whole field mayfall within about ± 0.10 mm. Referring to FIG. 7(c), the focus variationwith respect to the three different wavelengths (920 nm, 940 nm and 960nm) in the whole field may fall within about ± 0.40 mm Referring to FIG.7(d), and more specifically the horizontal axis of FIG. 7(d), thevariation of the distortion aberration may be within about ± 3%.

The distance from the object-side surface L1A1 of the first lens elementL1 to the image plane IMA along the optical axis (TTL) may be about4.105 mm, Fno may be about 1.33, HFOV may be about 38.992 degrees, andthe effective focal length (EFL) of the optical imaging lens 1 may beabout 2.479 mm. In accordance with these values, the present embodimentmay provide an optical imaging lens having a shortened length, anextended field of view and an increased aperture while improving opticalperformance.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2)of the present embodiment.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having four lenselements according to a second example embodiment. FIG. 11 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 2 according to the secondexample embodiment. FIG. 12 shows an example table of optical data ofeach lens element of the optical imaging lens 2 according to the secondexample embodiment. FIG. 13 shows an example table of aspherical data ofthe optical imaging lens 2 according to the second example embodiment.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3 and a fourth lenselement L4.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, and L4A1 and the image-sidesurfaces L1A2, L2A2, L3A2, and L4A2 may be generally similar to theoptical imaging lens 1, but the differences between the optical imaginglens 1 and the optical imaging lens 2 may include the concave or concavesurface structures of the object-side surface L3A1, a radius ofcurvature, a thickness, aspherical data, and/or an effective focallength of each lens element. More specifically, the periphery regionL3A1P of the object-side surface L3A1 of the third lens element L3 ofthe optical imaging lens 2 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 12 for the opticalcharacteristics of each lens element in the optical imaging lens 2 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 11(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.03 mm Referring to FIG. 11(b), the focus variation withrespect to the three different wavelengths (920 nm, 940 nm and 960 nm)in the whole field may fall within about ± 0.10 mm Referring to FIG.11(c), the focus variation with respect to the three differentwavelengths (920 nm, 940 nm and 960 nm) in the whole field may fallwithin about ±0.30 mm Referring to FIG. 11(d), the variation of thedistortion aberration of the optical imaging lens 2 may be within about± 3%.

In comparison with the first embodiment, the longitudinal sphericalaberration and the field curvature aberration in the tangentialdirection in the second embodiment may be smaller, and the field of viewof the optical imaging lens 2 may be larger as shown in FIG. 11 and FIG.12. Moreover, the optical imaging lens 2 may be easier to bemanufactured, such that yield thereof may be higher.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2)of the present embodiment.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having four lenselements according to a third example embodiment. FIG. 15 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 3 according to the third exampleembodiment. FIG. 16 shows an example table of optical data of each lenselement of the optical imaging lens 3 according to the third exampleembodiment. FIG. 17 shows an example table of aspherical data of theoptical imaging lens 3 according to the third example embodiment.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3 and a fourth lenselement L4.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L2A1, L3A1, and L4A1 and the image-sidesurfaces L1A2, L2A2, L3A2, and L4A2 may be generally similar to theoptical imaging lens 1, but the differences between the optical imaginglens 1 and the optical imaging lens 3 may include the concave or concavesurface structures of the object-side surface L1A1, a radius ofcurvature, a thickness, aspherical data, and/or an effective focallength of each lens element. More specifically, the periphery regionL1A1P of the object-side surface L1A1 of the first lens element L1 ofthe optical imaging lens 3 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 16 for the opticalcharacteristics of each lens element in the optical imaging lens 3 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 15(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.03 mm Referring to FIG. 15(b), the focus variation withrespect to the three different wavelengths (920 nm, 940 nm and 960 nm)in the whole field may fall within about ± 0.10 mm Referring to FIG.15(c), the focus variation with respect to the three differentwavelengths (920 nm, 940 nm and 960 nm) in the whole field may fallwithin about ±0.40 mm Referring to FIG. 15(d), the variation of thedistortion aberration of the optical imaging lens 3 may be within about± 3%.

In comparison with the first embodiment, the effective focal length ofthe optical imaging lens 3 may be shorter be smaller as shown in FIG. 15and FIG. 16. Moreover, the optical imaging lens 3 may be easier to bemanufactured, such that yield thereof may be higher.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2) of the present embodiment.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having four lenselements according to a fourth example embodiment. FIG. 19 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 4 according to the fourthexample embodiment. FIG. 20 shows an example table of optical data ofeach lens element of the optical imaging lens 4 according to the fourthexample embodiment. FIG. 21 shows an example table of aspherical data ofthe optical imaging lens 4 according to the fourth example embodiment.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, an aperture stopSTO, a second lens element L2, a third lens element L3 and a fourth lenselement L4.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, and L4A1 and the image-sidesurfaces L1A2, L2A2, L3A2, and L4A2 may be generally similar to theoptical imaging lens 1, but the differences between the optical imaginglens 1 and the optical imaging lens 4 may include the position of theaperture stop STO, a radius of curvature, a thickness, aspherical data,and/or an effective focal length of each lens element. Morespecifically, the aperture stop STO is arranged between the first lenselement L1 and the second lens element L2.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 20 for the opticalcharacteristics of each lens element in the optical imaging lens 4 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 19(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.12 mm Referring to FIG. 19(b), the focus variation withrespect to the three different wavelengths (920 nm, 940 nm and 960 nm)in the whole field may fall within about ± 0.12 mm Referring to FIG.19(c), the focus variation with respect to the three differentwavelengths (920 nm, 940 nm and 960 nm) in the whole field may fallwithin about ±0.16 mm Referring to FIG. 19(d), the variation of thedistortion aberration of the optical imaging lens 4 may be within about± 3%.

In comparison with the first embodiment, the field curvature aberrationin the tangential direction in the fourth embodiment may be smaller andthe value of the aperture of the optical image lens 4 may be larger asshown in FIG. 19 and FIG. 20. Moreover, the optical imaging lens 4 maybe easier to be manufactured, such that yield thereof may be higher.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2) of the present embodiment.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having four lenselements according to a fifth example embodiment. FIG. 23 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 5 according to the fifth exampleembodiment. FIG. 24 shows an example table of optical data of each lenselement of the optical imaging lens 5 according to the fifth exampleembodiment. FIG. 25 shows an example table of aspherical data of theoptical imaging lens 5 according to the fifth example embodiment.

As shown in FIG. 22, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3 and a fourth lenselement L4.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L2A1, L3A1, and L4A1 and the image-sidesurfaces L1A2, L2A2, L3A2, and L4A2 may be generally similar to theoptical imaging lens 1, but the differences between the optical imaginglens 1 and the optical imaging lens 5 may include the concave or concavesurface structures of the object-side surface L1A1, a radius ofcurvature, a thickness, aspherical data, and/or an effective focallength of each lens element. More specifically, the periphery regionL1A1P of the object-side surface L1A1 of the first lens element L1 maybe convex

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 24 for the opticalcharacteristics of each lens element in the optical imaging lens 5 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 23(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.02 mm Referring to FIG. 23(b), the focus variation withrespect to the three different wavelengths (920 nm, 940 nm and 960 nm)in the whole field may fall within about ± 0.04 mm Referring to FIG.23(c), the focus variation with respect to the three differentwavelengths (920 nm, 940 nm and 960 nm) in the whole field may fallwithin about ± 0.08 mm Referring to FIG. 23(d), the variation of thedistortion aberration of the optical imaging lens 5 may be within about± 2%.

In comparison with the first embodiment, the field of view of theoptical image lens 5 may be larger, and the field curvature aberrationin the sagittal direction and the tangential direction and thedistortion aberration in the fifth embodiment may be smaller as shown inFIG. 23 and FIG. 24. Moreover, the optical imaging lens 5 may be easierto be manufactured, such that yield thereof may be higher.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2) of the present embodiment.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having four lenselements according to a sixth example embodiment. FIG. 27 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 28 shows an example table of optical data of each lenselement of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 29 shows an example table of aspherical data of theoptical imaging lens 6 according to the sixth example embodiment.

As shown in FIG. 26, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3 and a fourth lenselement L4.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L2A1, L3A1, and L4A1 and the image-sidesurfaces L1A2, L2A2, L3A2, and L4A2 may be generally similar to theoptical imaging lens 1, but the differences between the optical imaginglens 1 and the optical imaging lens 6 may include the concave or concavesurface structures of the object-side surface L1A1, a radius ofcurvature, a thickness, aspherical data, and/or an effective focallength of each lens element. More specifically, the periphery regionL1A1P of the object-side surface L1A1 of the first lens element L1 ofthe optical imaging lens 6 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 28 for the opticalcharacteristics of each lens element in the optical imaging lens 6 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 27(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.016 mm Referring to FIG. 27(b), the focus variation withrespect to the three different wavelengths (920 nm, 940 nm and 960 nm)in the whole field may fall within about ± 0.04 mm Referring to FIG.27(c), the focus variation with respect to the three differentwavelengths (920 nm, 940 nm and 960 nm) in the whole field may fallwithin about ±0.06 mm Referring to FIG. 27(d), the variation of thedistortion aberration of the optical imaging lens 6 may be within about± 1.6%.

In comparison with the first embodiment, the field of view of theoptical imaging lens 6 may be larger, and the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction andthe tangential direction and the distortion aberration in the sixthembodiment may be smaller as shown in FIG. 27 and FIG. 28. Moreover, theoptical imaging lens 6 may be easier to be manufactured, such that yieldthereof may be higher.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2) of the present embodiment.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having four lenselements according to a seventh example embodiment. FIG. 31 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 7 according to theseventh example embodiment. FIG. 32 shows an example table of opticaldata of each lens element of the optical imaging lens 7 according to theseventh example embodiment. FIG. 33 shows an example table of asphericaldata of the optical imaging lens 7 according to the seventh exampleembodiment.

As shown in FIG. 30, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3 and a fourth lenselement L4.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, and L4A1 and the image-sidesurfaces L1A2, L2A2, L3A2, and L4A2 may be generally similar to theoptical imaging lens 1, but the differences between the optical imaginglens 1 and the optical imaging lens 7 may include the refracting powerof the fourth lens element L4, the concave or concave surface structuresof the object-side surface L3A1, a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the periphery region L3A1P of the object-side surfaceL3A1 of the third lens element L3 of the optical imaging lens 7 may beconcave, and the fourth lens element L4 may have positive refractingpower.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 32 for the opticalcharacteristics of each lens element in the optical imaging lens 7 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 31(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.01 mm Referring to FIG. 31(b), the focus variation withrespect to the three different wavelengths (920 nm, 940 nm and 960 nm)in the whole field may fall within about ± 4.00 mm Referring to FIG.31(c), the focus variation with respect to the three differentwavelengths (920 nm, 940 nm and 960 nm) in the whole field may fallwithin about ± 16.00 mm Referring to FIG. 31(d), the variation of thedistortion aberration of the optical imaging lens 7 may be within about± 40%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 7 may be shorter, the field of view of theoptical image lens 7 may be larger, and the longitudinal sphericalaberration in the seventh embodiment may be smaller as shown in FIG. 31and FIG. 32. Moreover, the optical imaging lens 7 may be easier to bemanufactured, such that yield thereof may be higher.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2) of the present embodiment.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having four lenselements according to an eighth example embodiment. FIG. 35 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 8 according to theeighth example embodiment. FIG. 36 shows an example table of opticaldata of each lens element of the optical imaging lens 8 according to theeighth example embodiment. FIG. 37 shows an example table of asphericaldata of the optical imaging lens 8 according to the eighth exampleembodiment.

As shown in FIG. 34, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, and a fourth lenselement L4.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, and L4A1 and the image-sidesurfaces L1A2, L2A2, and L4A2 may be generally similar to the opticalimaging lens 1, but the differences between the optical imaging lens 1and the optical imaging lens 8 may include the concave or concavesurface structures of the image-side surface L3A2, a radius ofcurvature, a thickness, aspherical data, and/or an effective focallength of each lens element. More specifically, the periphery regionL3A2P of the image-side surface L3A2 of the third lens element L3 of theoptical imaging lens 8 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 36 for the opticalcharacteristics of each lens element in the optical imaging lens 8 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 35(a), theoffset of the off-axis light relative to the image point may be withinabout ± 0.10 mm Referring to FIG. 35(b), the focus variation withrespect to the three different wavelengths (920 nm, 940 nm and 960 nm)in the whole field may fall within about ± 0.40 mm Referring to FIG.35(c), the focus variation with respect to the three differentwavelengths (920 nm, 940 nm and 960 nm) in the whole field may fallwithin about ± 0.40 mm Referring to FIG. 35(d), the variation of thedistortion aberration of the optical imaging lens 8 may be within about± 8%.

In comparison with the first embodiment, the length of the opticalimaging lens 8 may be shorter as shown in FIG. 35 and FIG. 36. Moreover,the optical imaging lens 8 may be easier to be manufactured, such thatyield thereof may be higher.

Please refer to FIG. 38 for the values of T1, G12, T2, G23, T3, G34, T4,G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4,TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3), (ALT+BFL)/ImgH,(T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL, TL/EFL, TTL/ImgH,AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3, (T2+G23+T3)/(T1+T4), (T1+T2)/T3,and AAG/(T1+T2) of the present embodiment.

Please refer to FIG. 38 which show the values of T1, G12, T2, G23, T3,G34, T4, G4F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL, (G34+T4)/AAG, V1+V2+V3+V4, TTL/EFL, TL/ImgH, AAG/T1, ALT/EFL, TL/(G23+T3),(ALT+BFL)/ImgH, (T3+G34+T4)/(T1+G12), TTL/(T1+G12+T2+G23+T3), EFL/BFL,TL/EFL, TTL/ImgH, AAG/G23, ALT/(T2+T3), TL/BFL, BFL/T3,(T2+G23+T3)/(T1+T4), (T1+T2)/T3, and AAG/(T1+T2) of all embodiments, andit may be clear that the optical imaging lenses of any one of the eightembodiments may satisfy the Inequalities (1)-(20).

The optical imaging lens in each embodiment of the present disclosurewith the arrangements of the convex or concave surface structuresdescribed below may advantageously increase the value of HFOV and theaperture with improved imaging quality: the first lens element may havenegative refracting power, the second lens element may have positiverefracting power, a periphery region of the object-side surface of thesecond lens element may be concave, an optical axis region of theimage-side surface of the second lens element may be concave, andoptical axis region of the object-side surface of the third lens elementmay be concave, an optical axis region of the image-side surface of thefourth lens element may be concave, the optical imaging lens maycomprise no other lenses having refracting power beyond the four lenselements, and the optical imaging lens may satisfy Inequality (1):(G34+T4)/AAG≤2.200 and Inequality (2): V1+V2+V3+V4≥110.000.Alternatively, the first lens element may have negative refractingpower, a periphery region of the image-side surface of the first lenselement may be convex, the second lens element may have positiverefracting power, a periphery region of the object-side surface of thesecond lens element may be concave, an optical axis region of theimage-side surface of the second lens element may be concave, an opticalaxis region of the image-side surface of the fourth lens element may beconcave, the optical imaging lens may comprise no other lenses havingrefracting power beyond the four lens elements, and the optical imaginglens may satisfy Inequality (1): (G34+T4)/AAG≤2.200 and Inequality (2):V1+V2+V3+V4≥110.000.

The range of values within the maximum and minimum values derived fromthe combined ratios of the optical parameters can be implementedaccording to above mentioned embodiments.

According to above disclosure, the longitudinal spherical aberration,the field curvature aberration and the variation of the distortionaberration of each embodiment may meet the use requirements of variouselectronic products which implement an optical imaging lens. Moreover,the off-axis light with respect to 920 nm, 940 nm and 960 nm wavelengthsmay be focused around an image point, and the offset of the off-axislight for each curve relative to the image point may be controlled toeffectively inhibit the longitudinal spherical aberration, the fieldcurvature aberration and/or the variation of the distortion aberration.Further, as shown by the imaging quality data provided for eachembodiment, the distance between the 920 nm, 940 nm and 960 nmwavelengths may indicate that focusing ability and inhibiting abilityfor dispersion may be provided for different wavelengths.

In consideration of the non-predictability of the optical lens assembly,while the optical lens assembly may satisfy any one of inequalitiesdescribed above, the optical lens assembly herein according to thedisclosure may achieve a shortened length and smaller sphericalaberration, field curvature aberration, and/or distortion aberration,provide an enlarged field of view, increase an imaging quality and/orassembly yield, and/or effectively improve drawbacks of a typicaloptical lens assembly.

While various embodiments in accordance with the disclosed principlesare described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens comprising a first lenselement, a second lens element, a third lens element and a fourth lenselement sequentially from an object side to an image side along anoptical axis, each of the first, second, third and fourth lens elementshaving an object-side surface facing toward the object side and allowingimaging rays to pass through as well as an image-side surface facingtoward the image side and allowing the imaging rays to pass through, theoptical imaging lens comprising no other lens elements having refractingpower beyond the first, second, third and fourth lens elements wherein:the first lens element has negative refracting power; the second lenselement has positive refracting power; a periphery region of theobject-side surface of the second lens element is concave; an opticalaxis region of the image-side surface of the second lens element isconcave; an optical axis region of the object-side surface of the thirdlens element is concave; an optical axis region of the image-sidesurface of the fourth lens element is concave; a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis is represented by G34;a thickness of the fourth lens element along the optical axis isrepresented by T4; a sum of three air gaps from the first lens elementto the fourth lens element along the optical axis is represented by AAG;Abbe numbers of the first, second, third and fourth lens elements arerespectively represented by V1, V2, V3 and V4; and the optical imaginglens satisfies inequalities: (G34+T4)/AAG≤2.200 and V1+V2+V3+V4≥110.000.2. The optical imaging lens according to claim 1, wherein a distancefrom the object-side surface of the first lens element to an image planealong the optical axis is represented by TTL, an effective focal lengthof the optical imaging lens is represented by EFL, and the opticalimaging lens further satisfies an inequality: TTL/EFL≥2.500.
 3. Theoptical imaging lens according to claim 1, wherein a distance from theobject-side surface of the first lens element to the image-side surfaceof the fourth lens element along the optical axis is represented by TL,an image height of the optical imaging lens is represented by ImgH, andthe optical imaging lens further satisfies an inequality: TL/ImgH≤1.800.4. The optical imaging lens according to claim 1, wherein a thickness ofthe first lens element along the optical axis is represented by T1, andthe optical imaging lens further satisfies an inequality: AAG/T1≤1.600.5. The optical imaging lens according to claim 1, wherein a sum of thethicknesses of four lens elements from the first lens element to thefourth lens element along the optical is represented by ALT, aneffective focal length of the optical imaging lens is represented byEFL, and the optical imaging lens further satisfies an inequality:ALT/EFL≤1.300.
 6. The optical imaging lens according to claim 1, whereina distance from the object-side surface of the first lens element to theimage-side surface of the fourth lens element along the optical axis isrepresented by TL, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis is represented by G23, a thickness of the third lenselement along the optical axis is represented by T3, and the opticalimaging lens further satisfies an inequality: TL/(G23+T3)≤2.40.
 7. Theoptical imaging lens according to claim 1, wherein a distance from theimage-side surface of the fourth lens element to an image plane alongthe optical axis is represented by BFL, a sum of the thicknesses of fourlens elements from the first lens element to the fourth lens elementalong the optical axis is represented by ALT, an image height of theoptical imaging lens is represented by ImgH, and the optical imaginglens further satisfies an inequality: (ALT+BFL)/ImgH≤2.100.
 8. Theoptical imaging lens according to claim 1, wherein a thickness of thefirst lens element along the optical axis is represented by T1, athickness of the third lens element along the optical axis isrepresented by T3, a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis is represented by G12, and the optical imaging lensfurther satisfies an inequality: (T3+G34+T4)/(T1+G12) 2.800
 9. Theoptical imaging lens according to claim 1, wherein a distance from theobject-side surface of the first lens element to an image plane alongthe optical axis is represented by TTL, a thickness of the first lenselement along the optical axis is represented by T1, a thickness of thesecond lens element along the optical axis is represented by T2, athickness of the third lens element along the optical axis isrepresented by T3, a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis is represented by G12, a distance from the image-sidesurface of the second lens element to the object-side surface of thethird lens element along the optical axis is represented by G23, and theoptical imaging lens further satisfies an inequality:TTL/(T1+G12+T2+G23+T3)≤2.000.
 10. The optical imaging lens according toclaim 1, wherein a distance from the image-side surface of the fourthlens element to an image plane along the optical axis is represented byBFL, an effective focal length of the optical imaging lens isrepresented by EFL, and the optical imaging lens further satisfies aninequality: EFL/BFL≤2.200.
 11. An optical imaging lens comprising afirst lens element, a second lens element, a third lens element and afourth lens element sequentially from an object side to an image sidealong an optical axis, each of the first, second, third and fourth lenselements having an object-side surface facing toward the object side andallowing imaging rays to pass through as well as an image-side surfacefacing toward the image side and allowing the imaging rays to passthrough, the optical imaging lens comprising no other lens elementshaving refracting power beyond the first, second, third and fourth lenselements wherein: the first lens element has negative refracting power;a periphery region of the image-side surface of the first lens elementis convex; the second lens element has positive refracting power; aperiphery region of the object-side surface of the second lens elementis concave; an optical axis region of the image-side surface of thesecond lens element is concave; an optical axis region of the image-sidesurface of the fourth lens element is concave; a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis is represented by G34;a thickness of the fourth lens element along the optical axis isrepresented by T4; a sum of three air gaps from the first lens elementto the fourth lens element along the optical axis is represented by AAG;Abbe numbers of the first, second, third and fourth lens elements arerespectively represented by V1, V2, V3 and V4; and the optical imaginglens satisfies inequalities: (G34+T4)/AAG≤2.200 and V1+V2+V3+V4≤110.000.12. The optical imaging lens according to claim 11, wherein an effectivefocal length of the optical imaging lens is represented by EFL, adistance from the object-side surface of the first lens element to theimage-side surface of the fourth lens element along the optical axis isrepresented by TL, and the optical imaging lens further satisfies aninequality: TL/EFL≤1.700.
 13. The optical imaging lens according toclaim 11, wherein an image height of the optical imaging lens isrepresented by ImgH, a distance from the object-side surface of thefirst lens element to an image plane along the optical axis isrepresented by TTL, and the optical imaging lens further satisfies aninequality: TTL/ImgH≤2.400.
 14. The optical imaging lens according toclaim 11, wherein a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis is represented by G23, and the optical imaging lensfurther satisfies an inequality: AAG/G23 1.900.
 15. The optical imaginglens according to claim 11, wherein a sum of the thicknesses of fourlens elements from the first lens element to the fourth lens elementalong the optical axis is represented by ALT, a thickness of the secondlens element along the optical axis is represented by T2, a thickness ofthe third lens element along the optical axis is represented by T3, andthe optical imaging lens further satisfies an inequality:ALT/(T2+T3)≤1.800.
 16. The optical imaging lens according to claim 11,wherein a distance from the object-side surface of the first lenselement to the image-side surface of the fourth lens element along theoptical axis is represented by TL, a distance from the image-sidesurface of the fourth lens element to an image plane along the opticalaxis is represented by BFL, and the optical imaging lens furthersatisfies an inequality: TL/BFL≤2.600.
 17. The optical imaging lensaccording to claim 11, wherein a distance from the image-side surface ofthe fourth lens element to an image plane along the optical axis isrepresented by BFL, a thickness of the third lens element along theoptical axis is represented by T3, and the optical imaging lens furthersatisfies an inequality: BFL/T3≤1.800.
 18. The optical imaging lensaccording to claim 11, wherein a thickness of the first lens elementalong the optical axis is represented by T1, a thickness of the secondlens element along the optical axis is represented by T2, a thickness ofthe third lens element along the optical axis is represented by T3, adistance from the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis isrepresented by G23, and the optical imaging lens further satisfies aninequality: (T2+G23+T3)/(T1+T4)≤2.600.
 19. The optical imaging lensaccording to claim 11, wherein a thickness of the first lens elementalong the optical axis is represented by T1, a thickness of the secondlens element along the optical axis is represented by T2, a thickness ofthe third lens element along the optical axis is represented by T3, andthe optical imaging lens further satisfies an inequality:(T1+T2)/T3≤1.200.
 20. The optical imaging lens according to claim 11,wherein a thickness of the first lens element along the optical axis isrepresented by T1, a thickness of the second lens element along theoptical axis is represented by T2, and the optical imaging lens furthersatisfies an inequality: AAG/(T1+T2)≤1.000.